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    <title>Document</title>
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    <div></div>
    <script>
        console.log(location.search); //nuame=andy
        //先去掉？ substr("起始位置"，想截取几个字符，默认是截取全部)；
        var params = location.search.substr(1);
        console.log(params);
        //利用=把字符串分隔为数组 split('=')
        var arr = params.split("=");
        console.log(arr);
        console.log(arr[1]);
        //把数据库写入div里边
        var div = document.querySelector('div')
        div.innerHTML = arr[1] + "欢迎您";
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